The only other thing I wanted for the phone was a silicone case. I ordered the Amzer Silicone Skin Jelly Case on December 17, 2010 and it finally shipped January 6, 2011.
The case covers the side and the back of the Nexus S with clean cutouts on the back for the camera, flash and speaker. The bottom of the case has cutouts for the headphone jack and charging port. On the side of the case, there are raised bumps for the volume and power switches that work OK.
There is a slightly raised edge around the front of the case, which allows for putting the phone face down on a flat surface without concern about scratching the front. The Amzer case will provide scratch protection for the back and sides of the phone and a certain degree of impact protection, though I don’t really feel like testing that capability.
The case is available in eleven colors: black, gray, transparent white, hot pink, purple, maroon red, blue, orange, green and baby pink…
Update July 20, 2011: I have since switched to the Incipio Feather case